Question

If A = {Factors of 4} and B = {Factors of 5}, then $A\cap B$ is __________ .

• A. {1, 2}
• B. {1}
• C. {1, 2, 4, 5}
• D. {2, 4, 6}

Answer 1

The correct option is B

{1}

A = {Factors of 4} $\Rightarrow$ A = {1, 2, 4}

B = {Factors of 5} $\Rightarrow$ B = {1, 5}

$\therefore A\cap B=\left\{1\right\}$